Study on the Effect of Anchor Cable Prestress Loss on the Stability of Dual Structure Slopes

ZHU Fuhui; LAI Qingzhong; LIU Shunqing; SUN Jian

doi:10.13512/j.hndz.2026.01.10

Abstract：To study the effect of anchor cable prestress loss on the stability of dual structure slopes,the calculation method for anchor cable prestress loss under the influence of multiple factors was constructed.The finite element software Midas GTS NX was used to establish the numerical models of dual structure slope reinforced by prestressed anchor cable under self-weight and rainfall conditions.Based on the finite element limit equilibrium method,the variation laws of slope safety factors under different anchor cable prestress loss rates,anchor cable angles,softening coefficients,and rainfall-affected layer thicknesses were analyzed.The research results show that when the loss rate of anchor cable prestress varies from 0 to 80%,the safety factor of dual structure slope under self weight conditions decreases by about 12.0%,and the smaller the anchor cable inclination angle,the greater the decrease in safety factor.With the increase of the prestress loss rate of the anchor cable,the smaller the softening coefficient or the thicker the rainfall-affected layer,the greater the decrease in the safety factor.Under the dual effects of rainfall infiltration and prestress loss of anchor cable,the stable slopes reinforced with prestressed anchor cables may experience instability and failure.The research results provide theoretical support for the prevention and control of dual structure slopes during operation,and have practical engineering significance.